Question 394215
simplify 
{{{(10y^7)^4 (6y^-8)^-3}}}
= {{{10000y^28*(y^24/216)}}}
= {{{10000y^52/216}}}
= {{{1250y^52/27}}}
--------------------
You added the exponents where you should have multiplied.
{{{(y^7)^4 = y^28}}}
----------------------
This is multiplication and what I have so far is
10^4(y^7)^4(1/6)^3(1/y^8)^3 then I got 
10000y^11(1/216)(1/y^11)